[Xen-devel] [PATCH v6 01/12] misc/xenmicrocode: Upload a microcode blob to the hypervisor

[Chao Gao <chao.gao@xxxxxxxxx>]

This patch provides a tool for late microcode update.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Chao Gao <chao.gao@xxxxxxxxx>
---
 tools/libxc/include/xenctrl.h |  1 +
 tools/libxc/xc_misc.c         | 20 ++++++++++
 tools/misc/Makefile           |  4 ++
 tools/misc/xenmicrocode.c     | 89 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 114 insertions(+)
 create mode 100644 tools/misc/xenmicrocode.c

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 31cdda7..c69699b 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1245,6 +1245,7 @@ typedef uint32_t xc_node_to_node_dist_t;
 int xc_physinfo(xc_interface *xch, xc_physinfo_t *info);
 int xc_cputopoinfo(xc_interface *xch, unsigned *max_cpus,
                    xc_cputopo_t *cputopo);
+int xc_platform_op(xc_interface *xch, struct xen_platform_op *op);
 int xc_numainfo(xc_interface *xch, unsigned *max_nodes,
                 xc_meminfo_t *meminfo, uint32_t *distance);
 int xc_pcitopoinfo(xc_interface *xch, unsigned num_devs,
diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
index 5e6714a..061c7a5 100644
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -226,6 +226,26 @@ int xc_physinfo(xc_interface *xch,
     return 0;
 }
 
+int xc_platform_op(xc_interface *xch, struct xen_platform_op *op)
+{
+    int ret = 0;
+    DECLARE_PLATFORM_OP;
+    DECLARE_HYPERCALL_BOUNCE(op, sizeof(*op), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+
+    if ( xc_hypercall_bounce_pre(xch, op) )
+    {
+        PERROR("Could not bounce xen_platform_op memory buffer");
+        return -1;
+    }
+    op->interface_version = XENPF_INTERFACE_VERSION;
+
+    platform_op = *op;
+    ret = do_platform_op(xch, &platform_op);
+    xc_hypercall_bounce_post(xch, op);
+
+    return ret;
+}
+
 int xc_cputopoinfo(xc_interface *xch, unsigned *max_cpus,
                    xc_cputopo_t *cputopo)
 {
diff --git a/tools/misc/Makefile b/tools/misc/Makefile
index 51adb6f..c297a75 100644
--- a/tools/misc/Makefile
+++ b/tools/misc/Makefile
@@ -22,6 +22,7 @@ INSTALL_SBIN-$(CONFIG_X86)     += xen-hvmcrash
 INSTALL_SBIN-$(CONFIG_X86)     += xen-hvmctx
 INSTALL_SBIN-$(CONFIG_X86)     += xen-lowmemd
 INSTALL_SBIN-$(CONFIG_X86)     += xen-mfndump
+INSTALL_SBIN-$(CONFIG_X86)     += xenmicrocode
 INSTALL_SBIN                   += xen-tmem-list-parse
 INSTALL_SBIN                   += xencov
 INSTALL_SBIN                   += xenlockprof
@@ -114,4 +115,7 @@ xen-lowmemd: xen-lowmemd.o
 xencov: xencov.o
        $(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenctrl) $(APPEND_LDFLAGS)
 
+xenmicrocode: xenmicrocode.o
+       $(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenctrl) $(APPEND_LDFLAGS)
+
 -include $(DEPS_INCLUDE)
diff --git a/tools/misc/xenmicrocode.c b/tools/misc/xenmicrocode.c
new file mode 100644
index 0000000..e6c8a3d
--- /dev/null
+++ b/tools/misc/xenmicrocode.c
@@ -0,0 +1,89 @@
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <string.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <xenctrl.h>
+
+void show_help(void)
+{
+    fprintf(stderr,
+            "xenmicrocode: Xen microcode updating tool\n"
+            "Usage: xenmicrocode <microcode blob>\n");
+}
+
+int main(int argc, char *argv[])
+{
+    int fd, len, ret;
+    char *filename, *buf;
+    struct stat st;
+    struct xen_platform_op op;
+    xc_interface *xch;
+    DECLARE_HYPERCALL_BUFFER(struct xenpf_microcode_update, uc);
+
+    if (argc < 2)
+    {
+        show_help();
+        return 0;
+    }
+
+    filename = argv[1];
+    fd = open(filename, O_RDONLY);
+    if (fd < 0) {
+        fprintf(stderr, "Could not open %s. (err: %s)\n",
+                filename, strerror(errno));
+        return errno;
+    }
+
+    if (stat(filename, &st) != 0) {
+        fprintf(stderr, "Could not get the size of %s. (err: %s)\n",
+                filename, strerror(errno));
+        return errno;
+    }
+
+    len = st.st_size;
+    buf = mmap(0, len, PROT_READ, MAP_PRIVATE, fd, 0);
+    if (buf == MAP_FAILED) {
+        fprintf(stderr, "mmap failed. (error: %s)\n", strerror(errno));
+        return errno;
+    }
+
+    xch = xc_interface_open(0,0,0);
+    if (xch == NULL)
+    {
+        fprintf(stderr, "Error opening xc interface. (err: %s)\n",
+                strerror(errno));
+        return errno;
+    }
+
+    uc = xc_hypercall_buffer_alloc(xch, uc, len);
+    if (uc == NULL)
+        return -1;
+
+    memcpy(uc, buf, len);
+    set_xen_guest_handle(op.u.microcode.data, uc);
+    op.cmd = XENPF_microcode_update;
+    op.interface_version = XENPF_INTERFACE_VERSION;
+    op.u.microcode.length = len;
+    ret = xc_platform_op(xch, &op);
+    if ( ret )
+        fprintf(stderr, "Failed to update microcode. (err: %d)\n", ret);
+
+    xc_hypercall_buffer_free(xch, uc);
+    xc_interface_close(xch);
+
+    if (munmap(buf, len)) {
+        printf("Could not unmap: %d(%s)\n", errno, strerror(errno));
+        return errno;
+    }
+    close(fd);
+
+    return 0;
+}
-- 
1.8.3.1


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